9
votes
Vintage vs modern B&W photography techniques differ in color luminance - what's going on here?
Just to expand on Matt's answer a bit.
Most B&W films used during the first half of the 20th century were not panchromatic. They were much more sensitive to the energy in blue light than the ...
- 168k
6
votes
Accepted
Does red noise even at low ISO values mean a hardware problem with my camera's sensor?
No, this is not a problem.
I see red noise. I see green noise. I see blue noise.
That's not a surprise because there are three main colors in the Bayer filter, and the pixels beneath all of those ...
- 6,087
6
votes
Vintage vs modern B&W photography techniques differ in color luminance - what's going on here?
Photo films and digital sensors do not record colors exactly as seen by our eye / brain vision system.
Initially, photo films were only sensitive to the violet and blue region of the visual spectrum....
- 36.3k
5
votes
Vintage vs modern B&W photography techniques differ in color luminance - what's going on here?
Are any of these in the ballpark?
The last one: "imperfect chemical film response". Most black and white processes are not "panchromatic". That is, it does not respond the same way across the whole ...
- 140k
4
votes
Why does my subject's skin have such a red cast — did my auto white balance fail me?
Based on the sample images you've provided, AWB appears to be working fine. Neutral objects appear neutral: The plate, the concrete wall, the gravel path, the door, the gray shirt.
You are likely not ...
- 26.3k
3
votes
Does red noise even at low ISO values mean a hardware problem with my camera's sensor?
Your screenshots show ~300% magnification. For comparison, I have a 24" 1920x1200px (so ~94 ppi) monitor and viewing your picture at 30% zoom (which would roughly be the size at 300dpi), it just fills ...
- 6,307
2
votes
Accepted
How can I desaturate reds in post-processing using Rawtherapee (or Gimp)?
Left is with HSV equalizer's S-value decreased, right is original. Only a very quick demonstration, so I did not bother to fine-tune it, so please forgive the reddish edges of the blossom, especially ...
- 6,307
1
vote
How can I desaturate reds in post-processing using Rawtherapee (or Gimp)?
A possible solution in Gimp:
In the Channels list, right-click on the Green or Blue channels, and Channel to selection
Select>Invert
Duplicate the layer
On the top layer: Color>Desaturate>...
- 16.7k
1
vote
How can I desaturate reds in post-processing using Rawtherapee (or Gimp)?
RawTherapee has an HSV tool. HSV stands for 'Hue-Saturation-Value' where Value means luminance or brightness. Other image processing applications call the same type of tool 'HSL (Hue-Saturation-...
- 168k
1
vote
Does red noise even at low ISO values mean a hardware problem with my camera's sensor?
The sensor used in Your Canon EOS Rebel SL2/200D is basically the same sensor used in the EOS 80D, the EOS Rebel T7i/800D, EOS-M M6, EOS-M M100, and 77D. It's Canon's current off-the-shelf APS-C ...
- 168k
1
vote
Why does my subject's skin have such a red cast — did my auto white balance fail me?
To make it simple the Auto-WB more or less tries to make a grey picture. In the second picture, the WB likely compensates for the red brick wall, and so reduces the red (the door on the right is also ...
- 16.7k
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